This On Demand CEU is a recorded presentation from a previously live webinar event. Water Resistive Barriers; Definitions, Purpose and Basic Properties; Development of Different Systems over the years & Where are we Today; Performance Properties and Codes; Selection& Guidelines for Specifying WRB's & Solutions for Sealing the Building Envelope; Roofing Underlayment, Window Flashings, Air Infiltration Controls, Below Grade and Exterior Deck Waterproofing.